Electric-light equipment



LECTRIC LIGHT EQUIPMENT Filed June 18, 1922 im by lipidi-sation. ledlunei8, 19%, {lei-iai No. dn, aus?. :in the lletheranids ,leugnet Sil,

'li/ly invention relatos to improvements in electric lighting equipmentin general and includes in particular alternating' cur rent lightequipment in which el'cctricblamps and condensers are used in the samecircuit. lin this respect my invention is in the nature of animprovement on the 'application of Giles Holst 'for UnitedStates LettersPat- Serial No. 413,468, now Patent No. nti-39,672. M

lin equipment of the above character,a the lamps used are designed tor alower voltage than the line voltage to which the equipment as a Whole isapplied. In using equip` ment the alcove type, it very often happensthat the filament fuses and hurnspout. The reason for this is asfollows: The lamp is sometimes turned on when the linevoltage is at apositive maximumthereby leaving,

the condenser in a positively charged conditionu New, it the lamp isturned on at the moment When the line voltage at a negative maximum, atloW of current takes place through the filament, due to the' combinedline and condenser voltages which fuses the filament.

Among the objects of my invention are, 'to provide means tor enablingthe condenser in an equipment of the above character to discharge ifleft vcharged when the circuit is hrolren and to provide other detailsof inipiovement tending to increase the elticiency and service uility oiequipment of the ahove character.4 l ,i

To accomplish the foregoing and other useful ends, my inventioncomprises means hereinafter more fully set forth andv claimed. r1lhe`accompanying drawing;4 1s a diagramm 'matic representation of thelighting equipment containingl the elements invention,

iin the above drawing', the lamp filament EZ is Ashown tapped by threeconductors 3, d and 5. ylhis divides the filament into two sections c'and Associated with the conductors l and 5 there is a switch 7 whichmay he o erated to close connection with either of tile conductors 4- or5. The switch i is shown permanently connected with one ci the mains 8,Whereas the other main 9 connected with the conductor 3 by Way ot my ofthe switch' il. HWhen the switch i' is thrown over into connection withthe con ductor 5, the whole filament 2 is brought into circuit. ln thatcase the current passes troni the conductor 8 through conductor 5 andiilament 2 to the conductor and baclr to the main 9. However, when theswitch is in the position as thrown, shown in the drawing in engagementwith the conductor 4, the condenser 'l0 is brought into circuit with thesection o: ot' the lilament. it will he seen that under theseconditions, section a of the iilanient is in series "with the condenserl() across the mains S and 9. lit', while the current is iiowing throughthe condenser, the switch 'll is thrown open, the condenser l0 may helelit charged as previous- (iti ly explained. it, however, theinsuiatingmedium l2 that separates the condenser plates is made with aresistance such as to permit a discharge to leak through between theplates orthc condenser, the charged conn dition will persist for only ashort period. rllhereifore, ilE the switch ll is closed again, thecondenser plates will he found discharged atleast to such an extent asto prevent any damage occurring to the filament. llt is not necessarythat the insulating medium l2 he used to discharge the condensers inns-lmuch as the condensers'may be shunted by a hi gh resistance elementhridged across the terminals of the condensenivhich element l have shownconnected to the terminals hy dotted lines.

Having disclosed the principle of my invention in two embodiments, otherequivu alent modifications will obviously suggest themselves to thoseversed in the art. lr

therefore do not wish to loe limited to .the

particular constructions shown, hut rat-her Sii to such embodimentswhich fall `liairly vvith-l Y in the scope of my claims.

What l claim as new and desire to secure by Letters Patent of the UnitedStates, is,-

l. In an electric lamp, an electric light filament, a condenserconnected in Circuit with the filament, the filament and the conl denseradapted te he connected across a source of operating potential, andmeans connecting the opposite plates oi the con denserv for insuring acomparatively rapid discharge of the condenser V:Lifter the 1am l A l vY p slstance leak soglslctxlneeted from the source of operating of theeonderclglllegnnigppgsmlgs l0 l o i e tively m id discha 5 ljngt al?lecilfelsmp, anteeetrlc .light after theplnmp is fiohfectte flren l tconne@ -e' 1n circuit .source of o exatn t with the filament the lamentand the con I p g p0 anual.

a v n W t l denser adapted to be connected across a. my hanldnisssirlgeyofhleneheggto Set S'Our@ Cinnaming potential, and .a high re-LADISLAUS PETER GRNER een'rmome 0F eoRRECTioN.

Patent No; 1,652,981. Granma member-1.3., 1927, u;

LADlSLAUS PETER GRANER.

fied that error appears in the printedspecfieation of the above numberedpatent requiring correction as follows: Page i, iine 18, for

the word "on" read "off" .and that the said Letters Patent should beread with this correction therein that thesame may conform to the recordof the ease in the Patent Office. Signed and sealed this 31st day ofJanuary, A. D. 1928.

It is hereby certi M. J. Moore,

Seal.. Acting Commissioner of Patents'.

